LXR iproute2/include/uapi/linux/netfilter_ipv6/ip6

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2/*
   3 * 25-Jul-1998 Major changes to allow for ip chain table
   4 *
   5 * 3-Jan-2000 Named tables to allow packet selection for different uses.
   6 */
   7
   8/*
   9 *      Format of an IP6 firewall descriptor
  10 *
  11 *      src, dst, src_mask, dst_mask are always stored in network byte order.
  12 *      flags are stored in host byte order (of course).
  13 *      Port numbers are stored in HOST byte order.
  14 */
  15
  16#ifndef _IP6_TABLES_H
  17#define _IP6_TABLES_H
  18
  19#include <linux/types.h>
  20
  21#include <linux/if.h>
  22#include <linux/netfilter_ipv6.h>
  23
  24#include <linux/netfilter/x_tables.h>
  25
  26#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  27#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  28#define ip6t_match xt_match
  29#define ip6t_target xt_target
  30#define ip6t_table xt_table
  31#define ip6t_get_revision xt_get_revision
  32#define ip6t_entry_match xt_entry_match
  33#define ip6t_entry_target xt_entry_target
  34#define ip6t_standard_target xt_standard_target
  35#define ip6t_error_target xt_error_target
  36#define ip6t_counters xt_counters
  37#define IP6T_CONTINUE XT_CONTINUE
  38#define IP6T_RETURN XT_RETURN
  39
  40/* Pre-iptables-1.4.0 */
  41#include <linux/netfilter/xt_tcpudp.h>
  42#define ip6t_tcp xt_tcp
  43#define ip6t_udp xt_udp
  44#define IP6T_TCP_INV_SRCPT      XT_TCP_INV_SRCPT
  45#define IP6T_TCP_INV_DSTPT      XT_TCP_INV_DSTPT
  46#define IP6T_TCP_INV_FLAGS      XT_TCP_INV_FLAGS
  47#define IP6T_TCP_INV_OPTION     XT_TCP_INV_OPTION
  48#define IP6T_TCP_INV_MASK       XT_TCP_INV_MASK
  49#define IP6T_UDP_INV_SRCPT      XT_UDP_INV_SRCPT
  50#define IP6T_UDP_INV_DSTPT      XT_UDP_INV_DSTPT
  51#define IP6T_UDP_INV_MASK       XT_UDP_INV_MASK
  52
  53#define ip6t_counters_info xt_counters_info
  54#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
  55#define IP6T_ERROR_TARGET XT_ERROR_TARGET
  56#define IP6T_MATCH_ITERATE(e, fn, args...) \
  57        XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
  58#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
  59        XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
  60
  61/* Yes, Virginia, you have to zero the padding. */
  62struct ip6t_ip6 {
  63        /* Source and destination IP6 addr */
  64        struct in6_addr src, dst;               
  65        /* Mask for src and dest IP6 addr */
  66        struct in6_addr smsk, dmsk;
  67        char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  68        unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  69
  70        /* Upper protocol number
  71         * - The allowed value is 0 (any) or protocol number of last parsable
  72         *   header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
  73         *   the non IPv6 extension headers.
  74         * - The protocol numbers of IPv6 extension headers except of ESP and
  75         *   MH do not match any packets.
  76         * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
  77         */
  78        __u16 proto;
  79        /* TOS to match iff flags & IP6T_F_TOS */
  80        __u8 tos;
  81
  82        /* Flags word */
  83        __u8 flags;
  84        /* Inverse flags */
  85        __u8 invflags;
  86};
  87
  88/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
  89#define IP6T_F_PROTO            0x01    /* Set if rule cares about upper 
  90                                           protocols */
  91#define IP6T_F_TOS              0x02    /* Match the TOS. */
  92#define IP6T_F_GOTO             0x04    /* Set if jump is a goto */
  93#define IP6T_F_MASK             0x07    /* All possible flag bits mask. */
  94
  95/* Values for "inv" field in struct ip6t_ip6. */
  96#define IP6T_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
  97#define IP6T_INV_VIA_OUT                0x02    /* Invert the sense of OUT IFACE */
  98#define IP6T_INV_TOS            0x04    /* Invert the sense of TOS. */
  99#define IP6T_INV_SRCIP          0x08    /* Invert the sense of SRC IP. */
 100#define IP6T_INV_DSTIP          0x10    /* Invert the sense of DST OP. */
 101#define IP6T_INV_FRAG           0x20    /* Invert the sense of FRAG. */
 102#define IP6T_INV_PROTO          XT_INV_PROTO
 103#define IP6T_INV_MASK           0x7F    /* All possible flag bits mask. */
 104
 105/* This structure defines each of the firewall rules.  Consists of 3
 106   parts which are 1) general IP header stuff 2) match specific
 107   stuff 3) the target to perform if the rule matches */
 108struct ip6t_entry {
 109        struct ip6t_ip6 ipv6;
 110
 111        /* Mark with fields that we care about. */
 112        unsigned int nfcache;
 113
 114        /* Size of ipt_entry + matches */
 115        __u16 target_offset;
 116        /* Size of ipt_entry + matches + target */
 117        __u16 next_offset;
 118
 119        /* Back pointer */
 120        unsigned int comefrom;
 121
 122        /* Packet and byte counters. */
 123        struct xt_counters counters;
 124
 125        /* The matches (if any), then the target. */
 126        unsigned char elems[0];
 127};
 128
 129/* Standard entry */
 130struct ip6t_standard {
 131        struct ip6t_entry entry;
 132        struct xt_standard_target target;
 133};
 134
 135struct ip6t_error {
 136        struct ip6t_entry entry;
 137        struct xt_error_target target;
 138};
 139
 140#define IP6T_ENTRY_INIT(__size)                                                \
 141{                                                                              \
 142        .target_offset  = sizeof(struct ip6t_entry),                           \
 143        .next_offset    = (__size),                                            \
 144}
 145
 146#define IP6T_STANDARD_INIT(__verdict)                                          \
 147{                                                                              \
 148        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
 149        .target         = XT_TARGET_INIT(XT_STANDARD_TARGET,                   \
 150                                         sizeof(struct xt_standard_target)),   \
 151        .target.verdict = -(__verdict) - 1,                                    \
 152}
 153
 154#define IP6T_ERROR_INIT                                                        \
 155{                                                                              \
 156        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),          \
 157        .target         = XT_TARGET_INIT(XT_ERROR_TARGET,                      \
 158                                         sizeof(struct xt_error_target)),      \
 159        .target.errorname = "ERROR",                                           \
 160}
 161
 162/*
 163 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 164 * Unlike BSD Linux inherits IP options so you don't have to use
 165 * a raw socket for this. Instead we check rights in the calls.
 166 *
 167 * ATTENTION: check linux/in6.h before adding new number here.
 168 */
 169#define IP6T_BASE_CTL                   64
 170
 171#define IP6T_SO_SET_REPLACE             (IP6T_BASE_CTL)
 172#define IP6T_SO_SET_ADD_COUNTERS        (IP6T_BASE_CTL + 1)
 173#define IP6T_SO_SET_MAX                 IP6T_SO_SET_ADD_COUNTERS
 174
 175#define IP6T_SO_GET_INFO                (IP6T_BASE_CTL)
 176#define IP6T_SO_GET_ENTRIES             (IP6T_BASE_CTL + 1)
 177#define IP6T_SO_GET_REVISION_MATCH      (IP6T_BASE_CTL + 4)
 178#define IP6T_SO_GET_REVISION_TARGET     (IP6T_BASE_CTL + 5)
 179#define IP6T_SO_GET_MAX                 IP6T_SO_GET_REVISION_TARGET
 180
 181/* obtain original address if REDIRECT'd connection */
 182#define IP6T_SO_ORIGINAL_DST            80
 183
 184/* ICMP matching stuff */
 185struct ip6t_icmp {
 186        __u8 type;                              /* type to match */
 187        __u8 code[2];                           /* range of code */
 188        __u8 invflags;                          /* Inverse flags */
 189};
 190
 191/* Values for "inv" field for struct ipt_icmp. */
 192#define IP6T_ICMP_INV   0x01    /* Invert the sense of type/code test */
 193
 194/* The argument to IP6T_SO_GET_INFO */
 195struct ip6t_getinfo {
 196        /* Which table: caller fills this in. */
 197        char name[XT_TABLE_MAXNAMELEN];
 198
 199        /* Kernel fills these in. */
 200        /* Which hook entry points are valid: bitmask */
 201        unsigned int valid_hooks;
 202
 203        /* Hook entry points: one per netfilter hook. */
 204        unsigned int hook_entry[NF_INET_NUMHOOKS];
 205
 206        /* Underflow points. */
 207        unsigned int underflow[NF_INET_NUMHOOKS];
 208
 209        /* Number of entries */
 210        unsigned int num_entries;
 211
 212        /* Size of entries. */
 213        unsigned int size;
 214};
 215
 216/* The argument to IP6T_SO_SET_REPLACE. */
 217struct ip6t_replace {
 218        /* Which table. */
 219        char name[XT_TABLE_MAXNAMELEN];
 220
 221        /* Which hook entry points are valid: bitmask.  You can't
 222           change this. */
 223        unsigned int valid_hooks;
 224
 225        /* Number of entries */
 226        unsigned int num_entries;
 227
 228        /* Total size of new entries */
 229        unsigned int size;
 230
 231        /* Hook entry points. */
 232        unsigned int hook_entry[NF_INET_NUMHOOKS];
 233
 234        /* Underflow points. */
 235        unsigned int underflow[NF_INET_NUMHOOKS];
 236
 237        /* Information about old entries: */
 238        /* Number of counters (must be equal to current number of entries). */
 239        unsigned int num_counters;
 240        /* The old entries' counters. */
 241        struct xt_counters *counters;
 242
 243        /* The entries (hang off end: not really an array). */
 244        struct ip6t_entry entries[0];
 245};
 246
 247/* The argument to IP6T_SO_GET_ENTRIES. */
 248struct ip6t_get_entries {
 249        /* Which table: user fills this in. */
 250        char name[XT_TABLE_MAXNAMELEN];
 251
 252        /* User fills this in: total entry size. */
 253        unsigned int size;
 254
 255        /* The entries. */
 256        struct ip6t_entry entrytable[0];
 257};
 258
 259/* Helper functions */
 260static __inline__ struct xt_entry_target *
 261ip6t_get_target(struct ip6t_entry *e)
 262{
 263        return (struct xt_entry_target *)((char *)e + e->target_offset);
 264}
 265
 266/*
 267 *      Main firewall chains definitions and global var's definitions.
 268 */
 269
 270#endif /* _IP6_TABLES_H */
 271